I have 100+ images. From each I need to create what might best be described as a thumbnail, but manually rather than automated. I need to manually choose which part of the image is used. What I need "automated" is ensuring the correct aspect ratio.
GIMP allows me to set the aspect ratio for the selection, which works well. But from there I still need to "crop to selection", "export as", enter a filename, and set export properties. Which makes it quite cumbersome when I have so many to work through.
Any suggestions for a better tool, or way to automate the rest of the process in GIMP?
My ideal workflow would be: - Open image "xxx.png" (or "xxx.jpg" etc) (with no additional prompts for how to perform the import) - Manually select the area I want to use as the thumbnail - Hit a key to save just that selection as (eg) "xxx.thumb.png", or "xxx.png" to a "thumbs" directory.
As few additional steps as possible so that the focus is on the selection of area, not the process.
Note that It's likely I'll want the output format to be png regardless of input format (or maybe jpeg, not yet decided - but it'll be a global choice not determined by the input format. That said I can post-process using imagemagick "convert" if I have to.
Thoughts?
On 12/03/2022 11:56, Mark Rogers wrote:
I have 100+ images. From each I need to create what might best be described as a thumbnail, but manually rather than automated. I need to manually choose which part of the image is used. What I need "automated" is ensuring the correct aspect ratio.
GIMP allows me to set the aspect ratio for the selection, which works well. But from there I still need to "crop to selection", "export as", enter a filename, and set export properties. Which makes it quite cumbersome when I have so many to work through.
Any suggestions for a better tool, or way to automate the rest of the process in GIMP?
My ideal workflow would be:
- Open image "xxx.png" (or "xxx.jpg" etc) (with no additional prompts
for how to perform the import)
- Manually select the area I want to use as the thumbnail
- Hit a key to save just that selection as (eg) "xxx.thumb.png", or
"xxx.png" to a "thumbs" directory.
As few additional steps as possible so that the focus is on the selection of area, not the process.
Note that It's likely I'll want the output format to be png regardless of input format (or maybe jpeg, not yet decided - but it'll be a global choice not determined by the input format. That said I can post-process using imagemagick "convert" if I have to.
Thoughts?
Backup the files, so you edit but still have the original to hand.
Use Gimp. Open all the files. Use crop to selection. Save to the original file (i.e. Export, rather than Export as). Quit gimp.
Then use image processing tool/tools to get the right size. I tend to use mogrify (part of ImageMagick) when I need to do a batch resize of images. I suspect it will do everything you need. Experiment, but backup your cropped files again first.
Steve
On Wed, 16 Mar 2022 at 09:33, steve-ALUG@hst.me.uk wrote:
Backup the files, so you edit but still have the original to hand.
Use Gimp. Open all the files. Use crop to selection. Save to the original file (i.e. Export, rather than Export as). Quit gimp.
Decent hack, should have thought of that myself!
(I went down a rabbit hole looking at script-fu and python-fu which led me nowhere!)
Then use image processing tool/tools to get the right size. I tend to use mogrify (part of ImageMagick) when I need to do a batch resize of images.
Yes, mogrify is great, I use the Imagemagick tools a lot, which is why I got stuck when I couldn't just automate the whole thing!
That said the
Experiment, but backup your cropped files again first.
Good advice. Also a useful strategy is put the originals into a tarball when you can't accidentally overwrite them!
-
Mark Rogers -
steve-ALUG＠hst.me.uk